221323320012 has 24 divisors (see below), whose sum is σ = 538874171136. Its totient is φ = 70566855568.

The previous prime is 221323320011. The next prime is 221323320019. The reversal of 221323320012 is 210023323122.

It is a happy number.

It is a super-2 number, since 2×221323320012² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221323320011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400947768 + ... + 400948319.

It is an arithmetic number, because the mean of its divisors is an integer number (22453090464).

Almost surely, 2^221323320012 is an apocalyptic number.

It is an amenable number.

221323320012 is an abundant number, since it is smaller than the sum of its proper divisors (317550851124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221323320012 is a wasteful number, since it uses less digits than its factorization.

221323320012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801896117 (or 801896115 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 221323320012 its reverse (210023323122), we get a palindrome (431346643134).

The spelling of 221323320012 in words is "two hundred twenty-one billion, three hundred twenty-three million, three hundred twenty thousand, twelve".